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Early Blastocyst

Image #

3 days

Note:

Once the morula develops an inner cavity, the embryo has achieved a new developmental milestone and is called a blastocyst.

Note:

The cells lining the perimeter of the embryo will help form the placenta and are called trophoblast cells. These cells bring water, minerals, and amino acids from the nutrient-rich environment outside the embryo into the blastocyst cavity where they can reach the cells of the inner cell mass.